<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>
    <style>

        div {
            margin: 0 auto; 
            margin-top: 20px;
            margin-bottom: 20px;
        }
        .box1 {
            width: 300px;
            height: 100px;
            background-color: red;
            border-radius: 50px 0 0 50px;
           
        }

        .box2 {
            width: 200px;
            height: 200px;
            background-color: red;
            border-radius: 50% 50%;
        }
        .box3 {
            width: 200px;
            height: 200px;
            background-color: red;
            border-radius: 50% 50% 0 0  / 50% 50% 0 0 ;
        }
    </style>
<body>
    <div class="box1"></div>
    <div class="box2"></div>
    <div class="box3"></div>
    <div class="box4"></div>
    <div class="box5"></div>
</body>
</html>